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Receive Discards Dell m6220

I am seeing a large number of receive discards on the uplink interfaces for my Dell blade switches in NPM. On the Dell switch, I cannot find any counters on the interface that show any receive discards at all. The problem began after a software upgrade to the latest code that I could find on Dell’s website from 1.1.0.10 to 3.1.3.9. I also configured sflow for the switch, but don’t know why that would cause the discards. Here is what the switch interface has on it for show statistics…

show statistics ethernet 1/g1

Total Packets Received (Octets)................ 59152059248

Packets Received 64 Octets..................... 3465751

Packets Received 65-127 Octets................. 5411285

Packets Received 128-255 Octets................ 2391515

Packets Received 256-511 Octets................ 2651711

Packets Received 512-1023 Octets............... 1964628

Packets Received 1024-1518 Octets.............. 36805149

Packets Received > 1522 Octets................. 0

Packets RX and TX 64 Octets.................... 4163736

Packets RX and TX 65-127 Octets................ 7266118

Packets RX and TX 128-255 Octets............... 3261244

Packets RX and TX 256-511 Octets............... 3173979

Packets RX and TX 512-1023 Octets.............. 3169983

Packets RX and TX 1024-1518 Octets............. 40470607

Packets RX and TX 1519-1522 Octets............. 0

Packets RX and TX 1523-2047 Octets............. 0

Packets RX and TX 2048-4095 Octets............. 0

Packets RX and TX 4096-9216 Octets............. 0

Total Packets Received Without Errors.......... 52690039

Unicast Packets Received....................... 52091281

Multicast Packets Received..................... 127554

--More-- or (q)uit

Broadcast Packets Received..................... 471204

Total Packets Received with MAC Errors......... 0

Jabbers Received............................... 0

Fragments/Undersize Received................... 0

Alignment Errors............................... 0

FCS Errors..................................... 0

Overruns....................................... 0

Total Received Packets Not Forwarded........... 0

Local Traffic Frames........................... 0

802.3x Pause Frames Received................... 0

Unacceptable Frame Type........................ 0

Multicast Tree Viable Discards................. 0

Reserved Address Discards...................... 0

Broadcast Storm Recovery....................... 0

CFI Discards................................... 0

Upstream Threshold............................. 0

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Accepted answers

swilliams

Dell support confirmed that the m6220 was indeed discarding packets. Apparently, it was doing that all along, but there was a bug in the earlier firmware that was causing that information to not be polled from SNMP. I am guessing that could also be why you can't see the same information from the command line. The switches are absolute junk. Dell support escalated our case to the chipset manufacturer and they had no fix for us at all. Performance problems with applications hosted on blade servers backed up the discards that Orion was showing. We ended up replacing the m6220s with pass through modules, and will never use a dell branded network device again. Orion in this case was not the issue.

All comments

swilliams

NCM has receive discards for this interface today at 9,403 so far. I check my VLAN setup on both ends of the connection, they are both set as access ports on the same VLAN. I don't have much experience working with the Dell switches, is there anywhere else that the interface receive discards might me shown? Could it be a data problem in NCM?

swilliams

Traffic on the interface is also light, this is typical...

FormerMember

hi swilliams,

We had a similar issue and changing interfaces helped remove the problem (although not a fix). The receive discards is a difficult one to troubleshoot, can be a lot of different things... faulty cabling, interface or NIC.

Once resolved the throughput increased - so its worth investing time.

swilliams

I did move the connection to a new port on the Cisco switch, and also setup a etherchannel connection with multiple ports. Both of the ports in the etherchannel have receive discards. I will try using different ports on the Dell switch change the physical path as well. Thanks for the reply, this one has me stumped.